Author

Peng Xu

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Preprint Sep 2026

Fast CZ gate in hybrid fluxonium-transmon systems with tunable couplers

Hybrid superconducting architectures combining different types of qubits offer a promising platform for exploiting their complementary advantages, yet high-fidelity entangling gates remain challenging because of strong nonlinearities and residual qubit-qubit interactions. Here, we propose a high-fidelity controlled-Z (...

Peng Xu, Yun-Long Wang, Yue-Chen Mu et al. · 0 citations

Preprint Jul 2026

Local Universality and Structural Certificates for Minimal Fixed-Depth Two-Qutrit Gate Decomposition

We study a dimension-saturating fixed-core ansatz in which four copies of a fixed, non-tunable two-qutrit core $K\in SU(9)$ are interleaved with five adjustable local layers from $L=SU(3)\otimes SU(3)$. Since $\dim SU(9)=80$ and $5\dim L=80$, this is the shortest fixed-core architecture not excluded by parameter counti...

Yurui Liu, Ruoting Dou, Peng Xu et al. · 0 citations